Scientific American - 10 2020 PDF
Preview Scientific American - 10 2020
OCTOBER 2020 SCIENTIFICAMERICAN.COM COVID DREAMS CONFRONTING RACISM UNCONQUERED MAYA INTERSTELLAR VISITORS How the pandemic is changing the world’s sleep Y E A R S C E L E B R A T I N G © 2020 Scientific American October 2020, ScientificAmerican.com 1 OctOber 2020 VOLUME 323, NUMBER 4 Photograph by Christian Rodriguez 70 ON tHe cOVer Dreams can be strange, but the COVID-19 pandemic has made them more bizarre. Many people report dreams about being threatened or being unable to cope. Lockdowns and social distancing, so alien to our normal lives, may also be overwhelming useful functions that dreams provide, such as helping us regulate our emotions. Illustration by Goñi Montes. MIND 30 Infectious Dreams How the COVID-19 pandemic is changing our sleeping lives. By Tore Nielsen VIROLOGY 36 What We Learned from AIDS Lessons from another pandemic for fighting COVID-19. By William A. Haseltine ASTRONOMY 42 Interstellar Interlopers Two recently sighted space rocks that came from beyond the solar system have puzzled astronomers. By David Jewitt and Amaya Moro-Martín PUBLIC HEALTH 50 Born Unequal Improving newborn health and why it matters now more than ever. By Janet Currie SOCIAL SCIENCES 58 How to Unlearn Racism Implicit bias training isn’t enough. What actually works? By Abigail Libers PSYCHOLOGY 64 All Together Now Synchronized activities such as group dancing and exercise promote surprisingly strong bonds, probably through changes in brain chemistry. By Marta Zaraska ARCHAEOLOGY 70 Fate of the Unconquered Maya The Lacandon Maya eluded the Spanish conquistadors and survived in the jungle for hundreds of years. Archaeological discoveries are revealing their past. By Zach Zorich © 2020 Scientific American 微 博 @ 英 文 杂 志 全 球 首 发 Scientific American (ISSN 0036-8733), Volume 323, Number 4, October 2020, published monthly by Scientific American, a division of Springer Nature America, Inc., 1 New York Plaza, Suite 4600, New York, N.Y. 10004-1562. Periodicals postage paid at New York, N.Y., and at additional mailing offices. Canada Post International Publications Mail (Canadian Distribution) Sales Agreement No. 40012504. Canadian BN No. 127387652RT; TVQ1218059275 TQ0001. Publication Mail Agreement #40012504. Return undeliverable mail to Scientific American, P.O. Box 819, Stn Main, Markham, ON L3P 8A2. Individual Subscription rates: 1 year $49.99 (USD), Canada $59.99 (USD), International $69.99 (USD). Institutional Subscription rates: Schools and Public Libraries: 1 year $84 (USD), Canada $89 (USD), International $96 (USD). Businesses and Colleges/Universities: 1 year $399 (USD), Canada $405 (USD), International $411 (USD). Postmaster: Send address changes to Scientific American, Box 3187, Harlan, Iowa 51537. Reprints inquiries:
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